Watlow EZ-ZONE RMH - Manual (Page 111)

Watlow EZ-ZONE ® RMH Module • 108 • Chapter 6 Features
Normal Operating Range
Low Side Alarm Range
High Side Alarm Range
Alarm High Set Point
Alarm Low Set Point
Time
Temperature
Alarm Set Points and Hysteresis
Alarm Hysteresis
Alarm Hysteresis
Alarm Latching
A latched alarm will remain active after the alarm
condition has passed. It can only be deactivated by
the user.
An active message, such as an alarm message,
will cause the RUI display to toggle between the nor-
mal settings and the active message in the upper dis-
play and [Attn] in the lower display.
Push the Advance Key ‰ to display [ignr] in the
upper display and the message source in the lower
display.
Use the Up ¿ or Down ¯ keys to scroll through
possible responses, such as Clear [`CLr] or Silence
[`SiL]
. Then push the Advance ‰ or Infinity ˆ key
to execute the action.
See the Keys and Displays chapter and the Home
Page chapter for more details.
An alarm that is not latched (self-clearing) will
deactivate automatically when the alarm condition
has passed.
Turn alarm latching on or off with Latching
[`A;LA]
(Setup Page, Alarm Menu).
Normal Operating Range
Alarm High
Set Point
Time
Temperature
Alarm Low
Set Point
Alarm Response with Hysteresis
The alarm state continues until the
temperature drops to the Alarm High
Set Point minus the hysteresis. A
latching alarm could be turned off by
the operator at this point. A
non-latching alarm would turn off
automatically.
The alarm state begins when the temperature
reaches the Alarm High Set Point
Process
Temperature
Alarm Hysteresis
Alarm Silencing
If alarm silencing is on the operator can disable the
alarm output while the controller is in an alarm
state. The process value or temperature has to enter
the normal operating range beyond the hysteresis
zone to activate the alarm output function again.
An active message, such as an alarm message,
will cause the display to toggle between the normal
settings and the active message in the upper display
and [Attn] in the lower display.
Push the Advance Key ‰ to display [ignr] in the
upper display and the message source in the lower
display.
Use the Up ¿ and Down ¯ keys to scroll through
possible responses, such as Clear [`CLr] or Silence
[`SiL]
. Then push the Advance ‰ or Infinity ˆ key
to execute the action.
Turn alarm silencing on or off with Silencing
[`A;Si] (Setup Page, Alarm Menu).
Alarm Blocking
Alarm blocking allows a system to warm up after
it has been started up. With alarm blocking on, an
alarm is not triggered when the process tempera-
ture is initially lower than the alarm low set point
or higher than the alarm high set point. The process
temperature has to enter the normal operating range
beyond the hysteresis zone to activate the alarm
function.
Turn alarm blocking on or off with Blocking
[`A;bL] (Setup Page, Alarm Menu).
Open Loop Detection
When Open Loop Detection is enabled [`l;de] , the
controller will look for the power output to be at
100%. Once there, the control will then begin to mon-
itor the Open Loop Detect Deviation [`l;dd] as it
relates to the value entered for the Open Loop Detect
Time [`l;dt]. If the specified time period expires
and the deviation does not occur, an Open Loop Error
will be triggered. Once the Open Loop Error condi-
tion exists the control mode will go off.
Note:
All prompts identified in this section can be found
in the Loop Menu of the Setup Page.
Using Lockout to Hide Pages and Menus
If unintentional changes to parameter settings might
raise safety concerns or lead to downtime, your can
use the lockout feature to make them more secure.
Each of the menus in the Factory Page and each
of the pages, except the Factory Page, has a security
level assigned to it. You can change the read and
write access to these menus and pages by using the
parameters in the Lockout Menu (Factory Page).
Lockout Menu
There are five parameters in the Lockout Menu (Fac-